Dyfyniad APA

ebrary, Inc. (1992). The National energy modeling system. National Academy Press.

Dyfyniad Arddull Chicago

ebrary, Inc. The National Energy Modeling System. Washington, D.C.: National Academy Press, 1992.

Dyfyniad MLA

ebrary, Inc. The National Energy Modeling System. National Academy Press, 1992.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.